Dual-Reader Document Scanner Startup Sequence Optimization
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Solution Overview
Problem
Existing document reading devices with auto document feeders (ADFs) in image forming apparatuses face long initial operation times when transitioning from energy-saving mode to normal operation mode, especially when dual-face reading is enabled, leading to increased user waiting times and power consumption.
Innovation Solution
The implementation of a dual-reader system where the first reader initiates normal operations followed by a second reader, with the CIS initial operation being executed independently to reduce the overall energy-saving returning time, allowing the ADF to enter a ready state more quickly by separating and optimizing the initial operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the image reader performs both first initial operation and second initial operation sequentially when returning from energy-saving mode, then both readers are returned to normal operation mode reliably, but the energy-saving returning time is prolonged
Solution Approach 1:
The first initial operation for the first reader is performed before the second initial operation for the second reader when returning from energy-saving mode. This preliminary action sequence allows the system to prepare critical components in advance, reducing the total time required while ensuring reliable operation restoration.
Solution Approach 2:
The initial operation is divided into two separate operations: first initial operation for the first reader and second initial operation for the second reader. This segmentation allows for optimized execution where the first reader's initialization can be completed and partially utilized before the second reader finishes its initialization, reducing overall waiting time.
2Use of energy by stationary object
If power supplies other than sensing power are turned off in energy-saving mode, then power consumption is reduced, but the time to restore full operation increases
Solution Approach 1:
Power for the first reader is restored before power for the second reader when exiting energy-saving mode. This preliminary restoration allows the first reader to be operational sooner, reducing the effective waiting time while still maintaining power savings during the energy-saving mode through selective power management.
Data Source
AI summary
A document reading device including an image reader. The image reader includes a first reader to read a first image from a first face of a document fed by a document feeder and a second reader to read a second face of the document. An operation mode is switchable between a normal operation mode in which the image reader is in an operation enabled state and an energy-saving mode in which the image reader is in an operation stop state. In a return from the energy saving mode to the normal operation mode, the image reader performs a start-up operation including a first initial operation for returning the first reader to the normal operation mode and then performs a second initial operation for returning the second reader to the normal operation mode.